Top companies in London

Europe's largest fintech and AI hub by capital deployed and exits.

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Ranked by current headcount across companies headquartered in London. Refreshed monthly.

1
EY· Newington, Waterloo, New Kent Road, Westminster Bridge, London Bridge, Lambeth, Old Kent Road, Southwark Cathedral, Southwark, Lambeth North, South Bank, Borough, Bermondsey, England, United Kingdom
EY is building a better working world by creating new value for clients, people, society, the planet, while building trust in the capital markets.Enabled by data, AI and advanced technology, EY teams help clients shape the future with confidence and develop answers for the most pressing issues of today and tomorrow.EY teams in more than 150 countries work across a full spectrum of services in assurance, consulting, tax, strategy and transactions, strengthened by sector experience and diverse ecosystem partners. Find out more about the EY global network: http://ey.com/en_gl/legal-statement
- 408.9k employees
- Founded 1989
2
Shell· Newington, Waterloo, New Kent Road, Westminster Bridge, London Bridge, Lambeth, Old Kent Road, Southwark Cathedral, Southwark, Lambeth North, South Bank, Borough, Bermondsey, England, United Kingdom
Shell is a global group of energy and petrochemical companies, employing 96,000 people across 70+ countries. We serve around 1 million commercial and industrial customers, and around 33 million customers daily at our Shell-branded retail service stations.Our purpose is to power progress together by working with each other, our customers and our partners. #PoweringProgress
- Grant
- 219.4k employees
- Founded 1907
3
HSBC· South Quay, Canary Wharf, All Saints, Island Gardens, Cubitt Town, Mudchute, West India Quay, Heron Quays, Westferry, Millwall, Limehouse, Coldharbour, London Arena, East India, East India Dock Road, Poplar, Blackwall, England, United Kingdom
Our purpose is to open up a world of opportunity for our customers, investors and employees.We're one of the world’s largest banking and financial services organisations, serving about 41 million customers worldwide, from individual savers and investors to some of the world’s biggest companies and governments.Our network covers 56 countries and territories, and we’re here to use our unique expertise, capabilities, breadth and perspectives to help our customers capture opportunities.HSBC is listed on the London, Hong Kong, New York, and Bermuda stock exchanges.To view our social media terms and conditions please visit the following webpage: https://www.hsbc.com/terms-and-conditions
- Post-IPO debt
- 199.8k employees
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4
Unilever· London, England, United Kingdom
Every day, 3.4 billion people around the world enjoy our products - from ground-breaking brands like Hellmann's, Domestos, Dove and Rexona (to name just a few). Our brands lead the way - innovating in their fields, delighting their consumers and powering our business forward. And it is our people who make everything happen. Our bright and curious people who imagine and create the future - diverse, passionate and ambitious people. A role with us means endless opportunities with global brands that make markets and people who play to win. We make markets and create cultures through some of the biggest brands and best-known products in the world. Talented teams in 190 countries redefine the way we do business and set new standards for our brands. Always learning, always innovating. Is this your moment?
- Grant
- 156.5k employees
5
G4S· London, England, United Kingdom
G4S is a leading security and facility services company that provides proactive security services and cutting-edge smart technology to deliver tailored, integrated security solutions that allow clients to focus on their core business. Through a global workforce of approximately 800,000 people, we leverage best practices in communities all over the world. With revenues at approximately $20 billion, we are supported by efficient processes and systems that can only come with scale to help deliver our promise locally: keeping people safe so our communities can thrive. For more information on G4S, visit www.g4s.com.
- Post-IPO equity
- 117.9k employees
- Founded 1901

6
Aon· London, England, United Kingdom
We exist to shape decisions for the better — to protect and enrich the lives of people around the world. Through actionable analytic insight, globally integrated Risk Capital and Human Capital expertise, and locally relevant solutions, our colleagues provide clients in over 120 countries with the clarity and confidence to make better risk and people decisions that help protect and grow their businesses.
- Post-IPO debt
- 95.1k employees
- Founded 1979
7
GSK· London, England, United Kingdom
We are uniting science, technology and talent to get ahead of disease together.Our community guidelines: https://gsk.to/socialmedia
- Post-IPO debt
- 91.9k employees
- Founded 1929
8
Barclays· South Quay, Canary Wharf, All Saints, Island Gardens, Cubitt Town, Mudchute, West India Quay, Heron Quays, Westferry, Millwall, Limehouse, Coldharbour, London Arena, East India, East India Dock Road, Poplar, Blackwall, England, United Kingdom
Our vision is to be the UK-centred leader in global finance. We are a diversified bank with comprehensive UK consumer, corporate and wealth and private banking franchises, a leading investment bank and a strong, specialist US consumer bank. Through these five divisions, we are working together for a better financial future for our customers, clients, and communities. For further information about Barclays, please visit home.barclays.
- 85k employees
9
bp· London, England, United Kingdom
Check out our commenting guidelines 👉 bp.com/CommentsGuide
- Post-IPO equity
- 81.9k employees
- Founded 1909
10
Standard Chartered· London, England, United Kingdom
We are a leading international banking group, with a presence in 54 of the world’s most dynamic markets. Our purpose is to drive commerce and prosperity through our unique diversity, and our heritage and values are expressed in our brand promise, here for good. If you’re interested joining Standard Chartered sign up to our Talent Network. Link: https://www.sc.com/careers/talentnetwork Standard Chartered PLC is listed on the London and Hong Kong stock exchanges.
- Post-IPO debt
- 80k employees

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Find engineers and operators at companies in London

London is one of the densest markets for technology talent in the world. The list above ranks the largest companies headquartered in London by current headcount, drawn from public LinkedIn and Crunchbase records. With 22,981 matching companies in Refolk’s index, the depth of engineers, designers, product managers, and founders is broad across stages and industries.

Hiring in London usually means hiring out of these companies. The biggest names anchor the talent pool - every senior engineer in London likely has at least one of them on their resume - and the fast-growing ones generate the most movement.

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How this list is built

Refolk pulled the largest companies headquartered in London from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 25 employees. The list refreshes monthly.

Last refreshed: Tue, 13 Oct 2026 21:59:04 GMT

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How is this ranking built?

The list draws on the public company graph - headcount and growth signals, funding history, and recency. The criteria chips at the top show exactly which filters produced it, and the methodology section explains the ranking.

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